[#255] Fixed type mismatch for MultipleInstances

[bozho]

Pull Request (PR) description

Fixes ScheduledTask MultipleInstances type mismatch in Get-TargeResource

This Pull Request (PR) fixes the following issues

• Fixes ScheduledTask: Type mismatch with MultipleInstances option #255

Task list

• Added an entry under the Unreleased section of the change log in the CHANGELOG.md.
  Entry should say what was changed, and how that affects users (if applicable).
• Resource documentation added/updated in README.md in the resource folder.
• Resource parameter descriptions added/updated in schema.mof
  and comment-based help.
• Comment-based help added/updated.
• Localization strings added/updated in all localization files as appropriate.
• Examples appropriately added/updated.
• Unit tests added/updated. See DSC Resource Testing Guidelines.
• Integration tests added/updated (where possible). See DSC Resource Testing Guidelines.
• New/changed code adheres to DSC Resource Style Guidelines and Best Practices.

---

This change is 

[codecov-io]

Codecov Report

Merging #256 into dev will not change coverage.
The diff coverage is 100%.

@@         Coverage Diff         @@
##            dev   #256   +/-   ##
===================================
  Coverage    88%    88%           
===================================
  Files        12     12           
  Lines      1398   1398           
===================================
  Hits       1231   1231           
  Misses      167    167

[PlagueHO]

Hi @bozho - can you fix the conflicts on this one and I'll get it reviewed? Thank you! 😁

[bozho]

@PlagueHO Done :)

[PlagueHO]

Reviewed 2 of 2 files at r1.
Reviewable status: complete! all files reviewed, all discussions resolved